package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.entity.dto.DishDto;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.*;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoopingCartController {
@Autowired
    private ShoppingCartService shoppingCartService;
//    @GetMapping("/list")
//    public R list(){
//        log.info("ada");
//    return null;
//}
    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        if(dishId != null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if(cartServiceOne != null){
            //如果已经存在，就在原来数量基础上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }else{
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> select(){
        Long currentId = BaseContext.getCurrentId();
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId,currentId);
        lqw.orderByDesc(ShoppingCart::getCreateTime);
        List<ShoppingCart> shoppingCartList = shoppingCartService.list(lqw);
        return R.success(shoppingCartList);
    }


    /**
     * 清空购物车
     *
     */
    @DeleteMapping("/clean")
    public R delete(){
        Long currentId = BaseContext.getCurrentId();
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId,currentId);
        shoppingCartService.remove(lqw);

        return R.success("清空购物车成功");

    }

    @PostMapping("/sub")
    public R deleteBy(@RequestBody ShoppingCart shoppingCart){
        log.info("删除购物车中的菜品");
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(shoppingCart.getSetmealId()!=null,ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        lqw.eq(shoppingCart.getDishId()!=null,ShoppingCart::getDishId ,shoppingCart.getDishId());
        ShoppingCart shoppingCartServiceOne = shoppingCartService.getOne(lqw);
        if (shoppingCartServiceOne.getNumber()>1){
            Integer number = shoppingCartServiceOne.getNumber();
            number = number-1;
            shoppingCartServiceOne.setNumber(number);
            shoppingCartService.updateById(shoppingCartServiceOne);
        }else {
            shoppingCartService.remove(lqw);
        }

        return R.success("删除成功");
    }
}
